Welcome, Not So Fancy! I'm glad you found us and joined in. Well, you sound a lot like us. I know I'm very stiff at night and in the morning. That's because I haven't been moving and, with fibro, you need to move and do stretching exercises. I'm so stiff that I use a cane for the numerous nightly trips to the bathroom. Nope. You aren't alone there either.
We usually have a low tolerance for pain but I've experienced what you are talking about, too. I had to have my colon removed. I had stitches inside me and 89 staples outside me when they sent me home. Three days later, I spent six hours at the mall Christmas shopping! Go figure! But, when my children would give me a playful swat, I'd gasp, grab my arm and I just knew I'd have a huge bruise. Of course a bruise never appeared. My kids felt badly and said they didn't hit me hard. My skin is very sensitive. I have to have soft fabrics, cut out the labels in most items, etc. So you can have low and high tolerance to pain.
Hugs can be mighty painful, too. Many here offer gentle hugs.
Do not worry about what other people think. YOU know how you feel. You won't be able to convince most of them either so don't waste your time and energy worrying about it. If you are married, and if you find out you do have fibro, there is a world of information at your fingertips on this forum to try to get them to understand. My husband did and my children are wonderful. They are all adults now, since I've had fibro for 24 years. Some have had fibro all of their lives. I was 40 when I was hit with it.
Now, how to approach your doctor. Read Fibro 101...the second thread on the forum. There are links to good information about fibro and you will learn a lot there. Good starting links are called Symptoms, What Else Could It Be, and A Thorough Explanation of Fibromyalgia. There is also a link called Pain Chart and Pain Journal. The pain chart is what they have in hospitals that will help you describe the pain you have when doing things. One of the charts even have faces and that really helps. You can print out the pain chart and start right now recording in it and listing your pain accurately. This will help your doctor know what really is going on with you.
Please be open and honest with your doctor. Most do want to help. If your doctor thinks it's all in your head, you need to find another doctor. (Many use a rheumatologist for fibro. I use a board certified Internist.) You are not crazy. These symptoms are very real. Anyway, let her know that you have been having these things happening for a while but were afraid they would think it was all in your head but it's not! Ask for tests to rule out other illness. They should run a myriad of tests to rule out illnesses that have the same symptoms as fibro. There is really no test for fibro except a tender point test but there are tests for the other illnesses. These illness are listed on the link I mentioned above called What Else Could It Be. If those tests come back normal, then a diagnosis of fibro is usually given. Give her what you have done in the pain journal and she should take it from there.
I don't take prescription pain meds. I use ibuprofen (600 mg x 4), extra strength Tylenol (1,000 x 4), malic acid /magnesium supplements, and vitamin D3 to help with pain and fatigue. Many are deficient in these vitamins and nutrients. There are links about them in Fibro 101. I also do the gentle stretching exercises on Fibro 101, I walk daily as a gentle exercise. I swim also. I use gentle massages once a month and I do pace myself when doing things. It all gets done but in a different time frame. If I do overdo, I pay for it dearly. Having a good outlook on life really helps me as much as the meds and vitamins, too. There is a post on positive thinking in Fibro 101 that is really very good.
By the way, some say their pain is too bad for just over the counter things. Well, if I don't take my ibuprofen, I feel like I've been beaten with a tire iron, barely can walk, and can hardly get out of a chair. So, yes, I do have a lot of pain without them.
You can have a full and enjoyable life in spite of this illness. I've done all sorts of things I never thought I could do. I've traveled overseas several times, snorkled, parasailed, and even walked for 8 hours through DisneyWorld and went on Splash Mountain with it's 55 foot drop! Loved it! 
So, once you find what helps you control the pain, you will be amazed what you can do in spite of fibro. Remember, what works for one doesn't necessarily work for another so don't get discouraged. You will find the key.
I'm looking forward to getting to know you better. Oh, I want to thank you for using paragraphs with spaces between them, too. I would never have gotten through the post without them but I could and am able to answer your questions. Don't hesitate to ask questions because we are here to help you. Hope to hear more from you soon.
Sherrine