Break. Up. With. Him. Someone who's so shockingly ignorant of what a loving dom/sub relationship should look like that he would say "your health and comfort in this situation don't matter because you're the sub" is someone who should NEVER EVER EVER be in a position of power over someone else. Untrustworthy, gross, lying, manipulative, immature bastard. Not that this would be remotely okay if you two were vanilla -- I'd still call him names and advise breaking up with him asap -- but it makes me all the more upset because I wish people like him would stop giving D/s a bad name.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.