Hi there, I am so very sorry that you are in this situation. I also have been recently told that my AMH is very low (3.7) and I am also still very young. It's hard to deal with on its own, but going through a break-up at the same time must be jsut sooooo much harder. I really feel for you and totally understand that you feel alone.
I am not sure what to say to make the break-up easier - just give yourself time to heal and look after yourself.
In regard to the low AHM, it depends how low yours is. As said mine is 3.7 and I am 29, so that is pretty low for my age and I have been told to get going ASAP. However, I also have been told that there is still a lot of chances. If you feel like time is running out (which I totally understand), I would suggest to tell your FS about this. I am not sure if this is an option or not, but maybe egg freezing is an option. That would mean you freeze eggs now for later use when you feel ready and have found the right partner to have children with. I am not sure if this is an option or not and if this is something you would consider, I just thought I mention it. As said it also depends how low your AHM is, as there is a lot of people around who have an AHM of 6,7,8 etc and they have been told that they still have quite a bit of time.
I will be thinking of you xx