Lasix is a Antihypertensives. A common side effect of those drugs ( furosemide , lasix) is decreased libido and loss of the ability to orgasm.
i really don't see any need for you to be taking lasix in the first place.. just get off of it and you'll be fine in a couple weeks.
and NO don't take an AI just for the heck of it when your not even currently running gear ! yes , go ahead and get blood work done, can only help