Extremely upset before going on vacation...

I am in the middle of multiple drug withdrawals and, as a result, my anxiety is at an all-time high. It's even inhumane, but I won't go into details.

I also have severe contamination OCD and soil is one of my biggest issues. However, I have a 3.5 year old son. And he gets down on the ground very often, as is normal at that age. However, I don't know how to react in these cases. If he gets on the ground and touches things or touches me right after, what should I do?

My question is all the more relevant as we are going on a ski vacation in less than 2 days and I will be even less likely to react. How should I react, just before we leave and during our stay, if my son gets on the floor and touches things or touches me right after? In these cases, what should I do?

I look forward to your responses and thank you all warmly!