Sadly, a known long term side effect of chemotherapy
is that it can lead to harmful effects on the oocytes and ovaries leading to premature ovarian failure
. Going by your FSH report, that seems to be the case. Occasionally, it may be reversible after a few years of finishing chemotherapy, but mostly it may persist. In such a scenario, Donor egg IVF i.e. doing IVF taking eggs from another woman who donates eggs for you is a reasonable solution in your case.