Whenever we work out, our bodies release toxins. You've had such good, loving advice and I'm sorry your friend was such a dolt. People can be so clueless.
I think something benign as a detoxificant like Zeolite, which pulls out toxins but leaves your minerals and vitamins alone, may be very helpful. I get mine here: http://www.etszeolite.com/index.html
I hope this helps and wish you the best! And very gentle, non-hurtful cyber hugs are coming your way from me.
Pamela, Type 3, strong secondary Type 4
"that through his death he might bring to nothing the one having the means to cause death, that is, the Devil;" Hebrews 2:14
"As the last enemy, death is to be brought to nothing." 1 Corinthians 15:26