Hi and Welcome, IAR!
First of all, I just wanted to say how sorry I am that you lost your wife. I honestly can't imagine how awful that must be, but did want you to know you have my condolences.
Also, I can't imagine how hard it must be to have fibro and be raising 3 and 5 year old boys alone! Kudos to you for even getting through the day! My boys are 4 and 6 and there are so many days when I just don't have enough in me to do everything they and I want to do together. That really frustrates me, so I know what you mean there. They are SO active, and I wish I could go, go, go right along with them, but most days I just don't have the energy. Fortunately, their father picks up the slack and does a great job. Many times I have thanked God for him, because I don't know how I could do it on my own. I was a single mom for 8 years, but that was pre-fibro and I only had one daughter at the time. That was hard enough! I just can't fathom doing it alone with 2. You definitely have my respect and admiration for that!
Yes, the fatigue and brain fog are both awful. I am not really sure what can be done about
either one of them. I don't take any meds (no insurance, super sensitive) so I just try to control my symptoms with baths and stretching and vitamins and time/energy management. That's probably not much help to you, though, with how busy you are!
I do sincerely hope the Lyrica helps you. Just as you said, some people get nothing out of it, and some people experience great relief. I will be praying that you fall into the latter category!
Anyway-welcome again. Great to have you in the "family"