My mothers thyroid went during her second pregnancy. Mine seemed to go then too. Tested hypo 6 months later but follow up tests have been all over the “normal” range, including almost high. Based on your description I wold suspect Hashimoto’s.
And whoever told you to suck it up regarding your thyroid is an idiot. Society would never tell a diabetic to suck it up because their body didn’t make enough insulin. There is a great thyroid site. I believe it is Real Thyroid Help. Try googling for that.