Why is my vomiting happening like clockwork?

Literally, every night the past week, once I hit about 8pm-9:30pm, I have to go into the bathroom for my daily dry-heave and vomit session. Once I vomit, I feel 100% better and can go back to previously scheduled activities. Yesterday was a 2-for-1 special and I got to puke TWICE during the same time block.

At one point can I wave the white flag and ask my doctor for some medication? It's not life-altering, but it's unpleasant and inconvenient. I become completely useless until I'm able to throw up.