how do I fix this? someone please help!

so lately i’ve been really stressed out. I had a pregnancy scare but I am now on my period and everything is fine, and because of the stress from that it took a physical toll on my body so then I started getting aches and pains in unusual places. so I told my boyfriend and my friends about it, they all told me that I was fine and that I should relax, and of course it’s all easier said than done. today I had another scare, a weird bump popped up on the inside of my bottom lip an hour and a half ago and it’s 97% gone now (still a very small bump) I naturally assumed it was a canker sore from all the crap food and sugar i’ve been eating. and I told my friend about it and he told me I had herpes or aids and then told me I was going to die. so as someone who fears death & doctors with a dangerous passion I naturally assumed he was correct. and my boyfriend didn’t like that I believed that (only a little bit, deep down I knew I was find my anxious thoughts took over) I could have herpes over it being a canker sore. the last few weeks he’s just made me feel so so so stupid about the things I worry about. I know my body better than anyone else so when something shows up that isn’t right I am clearly going to worry but instead of helping me he just goes to “you’re fine” instead of actually talking with me about it and helping me calm down. he makes me feel stupid a lot of the time lately. he said he doesn’t mean to but it keeps happening and I don’t know what to do someone help me. I love him so much but the last few weeks have been so hard for me emotionally and I just can’t seem to make myself feel better.