I know what you're going through. This past year at college, I started to have trouble walking through big places w/ lots of people. I was sick for like 3 months straight as well, super non-specific and just didn't seem to want to go away. My mom's been dealing w/ cancer, my sister has been going through a lot of psychological/social/hormonal issues, and my dad is...well, my dad.
I've often had times to were i physically dissociate under self-driven stress (like when there's one thing that's getting to you and then it just snowballs in your head, and then weird stuff like eating or exercising triggers it).
But my best advice to is to try and calmly have a dialogue with yourself every day, or every time these things set in. This can be meditation, or journal writing, whatever is the easiest way for you to make your thoughts and feelings tangible. There's always multiple explanations for things, but at the end of the day, the only way you can know anything is by trying it (now if I could only take my own advice haha). But I can say personally that even just by emailing my therapist about stuff on a semi-daily basis has expanded my awareness of my patterns and cycles. So when I get super worked up about something, I'm beginning to learn to ask why in a more constructive and supportive way, if that makes sense.
Yoga is also an excellent suggestion. I've been meaning to sign up for classes for a while...but really anything physically or mentally engaging that allows you to detach from the stress and view objectively and calmly and rationally, and gives you some release and enjoyment ya know?
