My brain is my enemy right now

So I'm 27 yeats old and my health is shit. I have plantar fasciitis, degenerative disk disease and arthritis in my lower back. I deal with chronic migraines almost weekly and headaches almost daily. For the past 4 or so months maybe even more. I came to realize thats its been harder and harder for me to find the right words, to put together or i say a word wrong. My husband doesn't think its a big deal and my short term memory is sharp but having to think back to something I've learned or experienced is becoming difficult for me to put into words. Idk, but I'm getting worried about my self. I dont know my birth father medical history or any of those family ties. My mother, and her line. Not so sure. Other than cancer in my grandma. I've felt so stupid. I graduated honor role in HS and I'm finally back in college after taking a few years off because i got married and pregnant, then my son was diagnosed with ASD. So, I'm just going back. I'm doing fairly well in school. B+ in both classes. I'm only taking 2 classes to not put stress on myself. And i havent felt stressed since my husband came back from deployment. But yea, im worried and just wanted to get that off my chest cus i didn't want to put it on my fb. Has anyone experienced anything like this or know anyone. And know what tests they had to get done???