Going from 1mg every 6 days to 2mg every 5 days is a big step. At 2.4mg weekly that's a significant jump from your previous dose. Overshooting makes eating feel like a chore and the volume becomes impossible. Lower it back down if that's the case.
HR jumped from 66 to 80 since starting Retatrutid two months back. Also getting bad sleep - waking every hour or so. Training 4-5x a week at the gym, so this is not normal for me.