Losing effect after 3 days

I’m on week three of 2.5, and for three days the shot works well. The day I take it I wake up completely nauseous, which is fun, and days two and three I feel a little squeamish around food also, although I do eat and get protein in. Then I wake up day 4 (so have 4,5,6,7) of NOTHING. No side effects, completely starving, etc.

I feel miserable enough on day 1 that it scares me to go up in dose, but if I have three good days of eating the last 4 kind of ruin it. Anyone else have this issue?