Dog doesn’t like being alone but also doesn’t like day care

I’m at a loss of what to do. My dog is very reactive to other dogs and strange people, but also whines, paces, and howls whenever he’s alone. We’ve been bringing him to doggy day care because of the training protocol for separation anxiety but his reactivity to other dogs has been getting worse, plus he overall seems more on edge. He’s on Fluvoxetine for almost 6 weeks now and it has made minimal difference so far. We’ve been doing desensitization training for the separation anxiety but also not much difference.

I’m wondering if going to the doggy day care is actually the worst choice between leaving him alone and taking him there. I know separation anxiety protocol calls for not leaving him alone, but if his reactivity is getting worse by going to day care then I’m not sure what to do.