First 100mg shot overmedicated me horribly- will my second one be like this too?

So I was on 2mg sub pill a day. Got my first sublocade shot 4 weeks ago, 100mg. It was entirely too much and I ended up over medicated for a week and unable to function. Couldn’t sleep for the first 4 days, it made me so high that I could barely walk. It was horrific.

My doctor wants me to get another 50mg shot. I am obviously terrified I’m going to be sick again. Has anyone had a similar experience? Is the second shot easier? If so, did you sleep after getting the second one right away?

TIA 🙏🏼