These are not usually strictly considered sexually transmitted diseases; however, they can be transmitted via fluid exchange and/or sexual relations. They can also be transmitted via airborne infection routes. For example, Mycoplasma species are commonly found in atypical pneumonia. Even in patients who do not present with acute pneumonia, they can become systemic and present as chronic illnesses whose diagnosis usually depends on which organs and tissues are infected and the outcome.
Thank you for your response, but after "researching" each of the above infections you mention, I'm a bit offended. I have been married 32 years with one sexual partner. I do not have any sexually transmitted disease! While I am certainly not a doctor, my symptoms fit none of the above infections that you mention.
Sincerely,
I would not want to second guess your neurologist, but you should also be checked for certain chronic infections that occur in high frequency in atypical MS, atypical ALS and other neurodegenerative conditions (I am assuming that you do not have a complete clinical diagnosis for one of these neurological diseases).
The types of infections that should be considered are probably not the ones that you were tested for in the first place, such as Mycoplasma, Chlamydia, Borrelia, etc. and viruses such as HHV6 and HSV.