Since I finished RCHOP chemotherapy 14 months ago, my wife has had an allergic reaction every time we have sex.  This reaction includes chest congestion, swelling of the eyes, itching.  She is also breastfeeding our first child - no one seems to have an answer, any ideas?
Your wife had a very peculiar symptoms and that is also after or during sex. My suspicion is that any allergen come in contact during sex., like condom, perfume, any intraluminal cream, bedsheets etc. you observe by omitting any of the above-mentioned thing if it is there.