Hello, I'm Brian37's wife. I have both chronic fatigue syndrome and fibromyalgia. It started out as CFS when I was younger, but at some point, also developed FMS. I have people ask me if I feel bad everyday. My response is that even though I do have a few "good" days her and there, constant fatigue and muscle achiness is always there. Mentally, I have what I like to call "brain farts" because I feel really out of it and stupid as well. I'm 34 now. However, I wasn't dx until I was 21 yrs old, even then reluctantly by my doctor at the time who did not believe in it. The hardest part is that no one really understands. I don't "look" sick to other people, so they think everything's OK. I have a 3 1/2 yr old son who zaps alot of my energy. I feel guilty that he may be an only child because I'm not so sure I could handle another baby (sleep deprivation, postpartum depression, etc). Also, I noticed a post that said something about having hasimoto's thyroiditis. My GP said that is also what I have, but my endocrinolgist said I have a multi-nodular goiter. Either way, I have an underlying thyroid problem. Anyway, hope this helps. Therefore, it is possible to have other illnesses/conditions in addition to FMS. Approximately 70% of people who have CFS also have FMS and vice versa.