Background info:
When I was about 15-16 I was severely depressed and self harmed. It would usually be some kind of punching, burning or cutting. Now that thats out of the way. . .
I'm currently in my early 20's and I have not relapsed in self harm for almost 7 years. I'm so proud of myself but recently I've been struggling with my mental health. I've had some severe anxiety that is making me miss work or have anxiety attacks at work. I'm very fortunate that my boss is understanding and I've been able to go home. But last week I decided to weigh myself for the first time in over 2 months and I've lost 20lbs(~9kg). I am 5'6" (168cm) and I weigh 106lbs (48kg).  Im a little freaked out because I was just over the line for underweight before. I wasn't intentionally starving myself but I would realize some days that I hadn't eaten all day or in a few days. I started developing these really bad stomach aches from not eating and I would get very nauseous all the time.
I'm just now starting to feel better but I don't know if I should see a doctor or not. I live in the US and currently don't qualify government health insurance and my work doesn't offer any type of health insurance. I'm not sure what to do. Have any of you ever experienced something similar and do you have any tips on how to cope? Thanks in advance for any help.