I fear you may be right. A lot of people have said they've been drinking a lot more.The issue with that is that when you read online about other services, you often need referral from the GP so it is catch 22. You have to go back to them to open up the door to other services which are now swamped as well.
At least we had a few weeks of "normality" over the summer but if it's going to be another longterm lockdown it may be easier just to find a drug problem and be spaced out the whole time. It wouldn't surprise me if lots of people have turned to drugs and booze