Hey, how are you feeling?
I'm not a Dr but your symptoms to do sound like 'CFS'. I've been told by 2 different specialists that I have 'CFS' (endocrinologist & immunologist), I'm not convinced as it's not an actual diagnose based on anything other than excluding anything else and seems to be a heading when the Drs cannot find anything else.
For about 5 minutes I was relived that I finally had a diagnosis, but that relieve quickly faded when I realised that no one can actually help me and you are left feeling nothing but frustration. For me, I just can't really accept that I am being told I have something, based on absolutely no actual evidence. My Dr said that I need to accept the diagnoses and that 'denial' was normal, however without actual evidence, I'm not convinced. I'm not saying that the symptoms don't exist, they do for sure and everyday has been a battle, however they are symptoms..we don't know what actually causes them.
I was offered antidepressants by my GP, I think they are given out too easily, I don't have depression but Dr's assume if you have fatigue than it must be depression. If you are depressed then perhaps anti-depressants will help but otherwise I would suggest not taking medication.
Like some of the other contributors have mentioned, I would definitely make sure nothing else is causing your symptoms. This would include tests for; Vitamin D deficiency, Vitamin B deficiency, hormonal imbalance, thyroid issues, food allergies, celiac, cortisol levels, iron deficiency and candida overgrowth. I've had all of these checked and are all fine.
From lots of research, my understanding is that your body and/or mind has been affected by either, an infection/illness, stress/trauma of an accident, or perhaps ongoing stress (mental or physical fatigue) and your body and/or mind literally makes you slow down or stop, by forcing these symptoms onto you - symptoms that cause inflammation of the body.
There is some recent research by the leading Dr in CFS/ME Jose Montoya (Stanford), suggesting CFS is linked to several proteins of inflammation in the body. Another school of thought is a link to the microbiology of the gut.
My personal view is that mental and/or physical stress, particularly over a sustained period of time, compromises the immune system and the body and/or mind spends a lot of time trying to deal with the stress and can no longer cope and as a result produces inflammations such as chronic sore throats, chronic fatigue, brain fog & all the other symptoms etc.
For me, when I look back at my life, I worked long hours in the city, not eating very much, exercising at the gym a lot, spent a lot of time moving from one job to the next (as I didn't like what I was doing but never had a chance to breath to consider 'what next'), moving house quite a few times and some family stuff that went on for a few years which required me to be the main support to my parents. I had bad bouts of viruses here and there over the years and I think that all of these factors contributed to my mind and body shouting "things need to change"!!.
I would highly recommend a book 'CFS Call for Soulwork' by Gretchen Brooks Nassar. It refers to 'The CFS Tree' which lists lots of things that may have contributed to a suppressed immune system (including physical and mental factors) which then lead to all of the CFS type of symptoms. The book refers to CFS as a teacher in how 'to be' and to have an honest look at what the 'roots' to your CFS may be and how this is an opportunity for spiritual growth. That may sound airy fairy but if you read the book you'll see the connections and I do believe the mind and body both contribute to the symptoms that are 'CFS' and how you can heal yourself (a good diet (limited sugar, lots of veg etc, a good probiotic for the gut), exercise, self love (putting yourself first, doing nice things for you), creating meaning in your life etc. You also need time to heal and rest both mentally and physically.
I hope this helps and be hopeful that you will feel better.
L