I am not a pharmacist but I believe that I can answer your questions about
lexapro accurately. I know that I can direct you to more information at least. I will do my best.
Without getting into complicated chemistry it's quite amazing how antidepressants do just as you describe. They can end up causing more depression for us ... the same very reason we began taking them.
The same problem is true for benzos causing anxiety or opiates causing more pain. We take
xanax when we are having panic attacks. As we progress if our dose isn't increased or if we stop the meds the anxiety condition can become worse than it was to start with. Opiate dependency often causes us to hurt more than we did when we began taking them. That is the main reason I am almost militant in how I detest these drugs. Drug dependency is very uncomfortable and painful in itself. These are good drugs for some people but they surely need to be monitored closely. I think all of these meds are totally over-prescribed the antidepressants, opiates and the benzos.
I am not qualified to reply to female hormone related questions. The others are pretty simple. Antidepressants do cause weight gain for LOTS of people. They are awful in that respect. Some people actually lose weight with SOME antidepressants like
wellbutrin. But lexapro,
zoloft,
celexa ... several of them are notorious for causing weight gain. So it's not just you.

I know I had to stop taking them for the weight issue. Told my dr that gaining the weight was making me more depressed than the original problem. I had to stop them.
Things should start improving for you soon following stopping the lexapro. These symptoms do go away after a while I promise. Time varies a little with each of us. You are not the only one dealing with this issue. I would draw your attention to another thread and category of this forum for your reference.
I suggest you go to the category FEATURED CONDITIONS. Find the thread titled simply Lexapro Withdrawal. Believe it or not there are over 1,000,000 views of this thread and over 9000 posts listed. It's one of the largest threads on this entire forum. And you will find the thread close to the beginning of the FEATURED CONDITIONS category. The thread is almost four years old so there is literally a TON of information there at your disposal. I wish you the best of luck in your search. God bless.