Weakness may be blood anemia

What you are sharing reminds me of autoimmune hemolytic anemia (AIHA) or Immune Mediated Hemolytic Anemia IMHA that 2-butoxyethanol would cause. Exposure looks like 'the flu' but it can be a lesser exposure and that looks like 'the sniffles' sinus congestion, a cold, digestion issues or farting and diarrhea

One gulf war vet was trying out for another job some months back, and he used up the available oxygen in red blood cells and couldn't replace it fast enough. He had shortness of breath and died
http://www.valdezlink.com/gwv/diesafterworkout2.htm#is

Do you also notice shortness of breath and also memory loss?

This anemia is very hard to diagnose.
I write web pages on this topic, but have been asked NOT to share on the public forum as they are interested in promoting medications, from what I understand ... or at least those who moderate the forum

Ask doctors to have the lab tech LOOK at the red blood cells and some of these things:
http://www.valdezlink.com/pages/bodytemp.htm

Compare 2-butoxyethanol to meds
http://www.valdezlink.com/re/drugs/list.htm

Something here may be of help
http://www.valdezlink.com/re/help/rituxan.htm

Have you also been in the military?

missnanny