Panic attacks after miscarriage

About two months ago, I had an unexpected miscarriage. I was two months along according to my doctor, although I hadn’t even been aware of the pregnancy at the time, as I am only 18, in college, and had been on the pill for about two weeks when I had sex. It was terrifying. I thought I was bleeding internally and I had the worst cramps I had ever experienced. Still, when I went to the doctor and she told me what had happened I strangely didn’t feel that upset because I don’t want a kid at this point in time. Anyways, my period didn’t come last month, which my doctor said was normal. I just got it for the first time since my miscarriage and had a major panic attack at the sight of my own period blood. I am not a squeamish person. Has anyone else experienced something like this? Every time I go to the bathroom I feel like I can’t breathe. It’s been hard for me to sleep as I have been having nightmares about it. I don’t know why. I didn’t feel connected to the baby and I was not trying to conceive so I feel like I should be fine, but I’m really not. I don’t know what to do.