I’ve been in and out of the doctor for a couple years, with weird pains, and most recently a lymph node that is a little enlarged in the neck. Obviously there are some scary (but unlikely) potential explanations. But, my sleep quality degrading over the years is something that has been happening much slower, and started much earlier.
Not a huge fan of self diagnosis but maybe some of the proposed dietary changes would be worth trying, since they seem fairly innocuous. I’m sure eating more apples won't hurt.
If anyone has experience with CFS and has advice, I’m all ears. I’d kill to sleep like I did when I was 18.
A second hallmark is unrefreshing sleep. Not necessarily that you don't sleep or don't sleep well, but that no matter how long or how well you sleep, you wake up feeling like you just ran a marathon. If you don't sleep well, see a sleep doctor. That may fix the issue.
[0] https://en.wikipedia.org/wiki/Erythrocyte_sedimentation_rate
There is certainly an overlap between CFS, IBS, lymph nodes, pain, fatigue, sleep problems and tinnitus: they can all be caused by stress. The most likely explanation ("I can barely stay awake during meetings") is probably that you need a better job.
Having said that, you do need to rule out other explanations, such as cancer. Talk to your doctor and see what he/she thinks.
And of course, we are watching for cancer. It’s very unlikely at my age, but I definitely can’t rule it out.
Even if you like your job and you think it's great, that doesn't mean it isn't stressful. IMHO if you have meetings then your job isn't great, but maybe you're a strange person who enjoys meetings :)
Anyway, all I'm saying is to think carefully about your job and decide whether or not it is right for you.
Also worth getting a sleep study done, in case it is sleep apnea.
Maybe you've already been checked but I just thought I'd mention it since it's a very commonly overlooked diagnosis (an estimated 80% of cases are not diagnosed), and declining sleep quality and falling asleep during the day are major symptoms of it. I have a relative that eventually got treated and it made a major difference for them.