TSH is volatile, and it can change as much as 70% intraday depending just on the time of day the blood was drawn. If your FT3 and FT4 didn't change, there was no change in your thyroid status.
Rule of thumb for FT4 is midrange (50%) and for FT3 upper half of range (50%+). Your FT4 is 14% of range, and your FT3 is 8%. Both of those are very, very low. I'm sure you'd feel better on meds.
I don't know if the iodine affected your TSH or not. Your FT3 and FT4 didn't change, so there was no real change in your condition. TSH does not cause any symptoms. It's only when TSH reflects a change in FT3 and FT4 levels that symptoms are caused...not by TSH, but by FT3 and FT4.
Do you plan to go back on meds?
free t 4 and free t 3 did not change, the range is for free t 3.0 (2.8-5.3) free t 4 1.0 (0.8-2.2), tpo 1.5 (0.0-9.0), tg ab less than 0.9 (0.0-4.0). Feeling hypo symptoms now, tired. Not sure if iodine supplementation doubled my tsh within a week?
Both your antibodies are negative, so you don't appear to have Hashi's. TPOab and TGab can both be somewhat elevated with other autoimmune conditions as well.
Are you back on thyroid meds now? What did your FT3 and FT4 go to when your TSH was 8.5? What are the reference ranges on your FT3 and FT4 (ranges vary lab to lab, so you have to post ranges with results). How long have you been postpartum?