Hi and welcome,
Low grade fevers can definitely cause fatigue but fevers, fatigue, painful headaches (migraine?), low positive ANA are not generally typical signs pointing towards neurological conditions like MS.
"a few tiny foci of increased T2 Signal without enhancement in the subcirtical white matter bilaterally. The report reads that these are nonspecific but within normal limits for a patient's age. A demyelination process such as multiple sclerosis cannot be excluded by imaging clinical correlation recommend. "
Your report is basically saying there isn't anything abnormal with what did come up on your brain MRI, you have a small number of subcortical lesions on both sides of your brain, which is within the normal amount for your age group. They have been described as without enhancement and tiny and that means they are all between 1-3mm in size, and non of them lit up to be suggestive or consistent demyelinating lesions, so they are classified as nonspecific.
Having a few tiny non specific subcortical lesions presenting bilaterally is not uncommon and typically these type of lesions are ischemic micro vascular white matter lesions.....finding more suggestive of demyelinating lesions would be things like lesions bigger than 3mm, being oval, having dawsons fingers, some enhancing lesions, lesions in any of the more common MS locations etc etc
"clinical correlation" is relating to your neurological assessment, your MRI results are not pointing towards anything being neurologically abnormal but it's entirely possible to have a normal brain and still have abnormal neurological clinical signs, so your neurological assessment could of been still suggestive or consistent with something being neurologically wrong.....if your assessment was also clinically normal your going to find your evidence it more pointing away from neurological conditions than towards.
Your situation definitely didn't present in any typical way for MS and your diagnostic evidence isn't suggestive, that alone wouldn't put MS at the top of your list as the most likely causation....as frustrating as this is for you, i'd highly recommend you keep open minded and not get overly focused on any one specific type of medical condition, go back to your GP and ask for his or her recommendation on what other tests you need to work out the cause of all your symptoms.
Hope that helps.......JJ