Anxiety? or something else?

This is going to be long so bare with me and thank you for reading.

Hello Im fairly new. I've visited this website in the past but coming back more frequently because I have Anxiety and Depression. My Anxiety is getting worse over the years and at times I begin to think that it might be something more severe like manic depression or bipolar. I saw a physiatrist because I pretty much had a breakdown in october. I was in an relationship where we weren't a good balance and working 6 days a week. I wasn't able to afford a therapist. I started on zoloft beginning of october and it was great, my mood felt very stable, I was able to make decisions rationally, and feel comfortable with myself to go out and do things. But 2 months in i began to notice side effects such as low libido, weight gain, and dark thoughts such as if i was driving down the freeway i will picture a god awful car accident happening. So i weaned myself with my physiatrists help in beginning of january. Now im noticing my anxiety and depression coming back but now im recognizing more things that i haven't before. Im noticing that I always worry about what other people think of me, and if i hear two people talking and if it sounds like they're gossiping i assume they're gossiping about me and i'll obsess over it for a day or even several days. I get these rushes at random feeling like im not doing anything with my life and im at the most lowest point when in reality i know i am not. i Have a decent grocery job with an estheticians license and plan to go back to school for massage. But its a huge rush feeling of extreme depression. Ive also noticed that I'll think about all these things that annoy me and think about it over and over and become fixated on one and want to call that person and chew them out, but i've never done that and know not to. But i go threw these in periods of feeling this for several weeks to over a month then they'll go away but then come back again. It makes me feel extremely unbalanced. A good friend of mine even approached me saying that she feels that i may be bipolar because my moods are good one day and down and out the next. and i began to think about that and i think she may be right but i still am not sure, maybe it just is severe depression mixed with anxiety. Anyone Have knowledge of what i go threw fits into what?

Thank you. Im going to see a doctor nezt week. I looked into a therapist but its way out of my price range