Increased tolerance?

I’ve been using CBD pretty much since it came to Holland and Barrett and at first it worked wonders for my anxiety and depression with it basically stifling all the negative thoughts. Lately though I feel like it’s just not been working as well with the negative thoughts creeping through and just generally feeling a bit meh. So I was just wondering if anyone else had experienced like a tolerance increase with it? Now to mix it up I’ve tried increasing the number of drops I take but that seems to have a negative impact on me like I feel worse than ever.