Either get them off the dark web, from a dealer, or fake a disease that would cause vertigo. Meniere's disease is the easiest to fake as it is occasionally idiopathic, which in the medical world means that it has no observable cause. You could also fake motion sickness and get scopolamine.
From what I hear, OTC drugs are not as effective, but trying some Diphenhydramine might not hurt. Antihistamines and most other drugs with the prefix "anti-" will probably help.
If you buy on the dark web, first-gen antipsychs are a MUST. These are super effective but have terrible side-effects. When your CTB'ing though, you probably won't care about side-effects. Serotonin 5-HT3 antagonists are also very powerful. Pick your poison.
P.S, assuming thats actually you in the pfp, I don't recommend putting your real face. This site operates on a VERY thin legal ground, and the sites owners are the only ones protected (under section 230 of US law.) Plus, some activist might try to dox you. Just be careful. Use a meme or miscellaneous pfp like mine.