I had it and was told I outgrew during my late teens it and was supposedly in remission for years - even though I was having a slew of issues, the docs dismissed me b/c my bloodwork was fine. Then, they finally said, 'you have psoriatic arthritis' after I could barely walk for 3 months when I was 25.
Memory loss and brain fog can also be caused by your liver acting up. I have it a lot myself. But, I also have liver problems.