Sudden nausea

Wondering if anyone else has had an experience like this.

I have been on mounjaro since December 2022 with a break due to insurance summer/fall 2023. I have been incredibly lucky and besides sulfur burps really had not had any side effects. Lost 140lbs but the last 6 weeks been gaining and losing the same 7lbs. Last months box felt like the medication wasn’t working, my A1C increased in my last blood work from 4.9 to 5.5( it hasn’t been this high since i had the break of mounjaro in 2023). Last week I opened a new box and it felt like mounjaro was working again (not sure on A1C as I won’t have that tested again for 2 months), but I basically had no appetite the entire week. Today is day 2 after injection of the second dose from this box and I had a protein shake and maybe 10 grapes for breakfast.. and hour in I suddenly felt so nauseous I had to throw up.. this is the first time I ever had this and am wondering if anyone has gone through feeling a box didn’t have the right dosage in them (I am on 15mg and have been for 10 months now, so it’s not that I am at a new dosage that is too high for me).

And for those that have dealt with nausea if you have any tips on how to deal with this I would greatly appreciate that.