First of all get off Lexapro - It causes DE. I experienced this for 2 years (some gals could get me off and some could not) and after doing some research decided to quit it cold turkey. No problem and my ability to climax during covered sex went back to normal. Stay off anti depressants if you want to be able to perform. If your a strip clubber / hobbyist you should having nothing to be depressed about unless your broke.
One thing - some gals are loose as a goose down there; perhaps they took some really big ones. Drop them for the ones who are tight enough.
Your condom should not be coming off. It sounds like your going limp. You need to get on viagra. Consult your doctor. You may need a couple of test shots with it in a strip club to see how it works and this just for the cost of a $20 lap dance. Take it about an hour before on an empty stomach. Also when withdrawing grab the bottom of the condom so it wont stay in there and cause a problem with say spillage. If you have been snipped wtf are you worried about? Condoms do break but your either in the program or not. If you chew viagra up and take it with water it may act faster (you can do this in a pinch like if the girl met you too early).
Also providers can be a good source in advising you if your condom fits properly for your size. My main one put me in magnum thin (Trojan large size) as she thought the regular size was too small for me. She expertly puts them on me and then does fantastic handjob foreplay, a very pleasurable experience (while I feel her) before she gets on top, leaning forward thrusting. With her nice tight pussy she gets me off in six minutes, sometimes I don't make it four.