Adverse Effect from LM, Any Advice?

Tried lions mane today for the first time around 13 hours ago and I have had a very unpleasant reaction. I took 1/4 of the stated dose from a UK based respected source via a tincture dissolved into a drink.

My heart rate jumped 60% and felt hot coupled with highly anxious and very jittery. I have managed to get a few hours sleep but I still feel very wired and on edge. Is there any advice on how I can try to flush my system or reduce my symptoms.