Firstly, sorry to hear you are finding things hard. It is a really tough stage for many of us, and it may be worth making a GP appointment to explore whether you are suffering from post natal depression, which is very common.
A couple of things stand out to me from your post. You make no mention of a partner - are you a single mom? If you have a partner, things like nail appointments and gym should be perfectly doable - maybe not as frequently as previously, but your partner should be making sure you still get some time to yourself each week. Maybe it's time for a chat with them?
Secondly, you use the term FTM which I think means "full time mom". I wonder what you mean by that? Everybody with a child is a full time mom - anything else is a logical impossibility.
But I wonder if the phrase means you have formed some sort of agreement with your partner, whereby you are fully responsible for all childcare?
If so, you need to unform it, quickly. It's absolutely unnecessary and unhelpful for anybody to assume that, if there are in fact two of you. If your partner works then yes, it makes sense that you do MORE of the childcare. But your partner, if you have one, is a FTM or FTD too! And they need to do their share, to protect your mental and physical health, allow themselves to bond with baby, etc.
Good luck. I really hope this improves for you. X