I am glad to her that you contacted a behaviorist but unfortunately it sounds like that isn't working the greatest. I do have some other options of things that you can try for anxiety. Most behaviorists recommend not using just one medication to treat anxiety. They actually recommend using 2-3 different approaches in each case of severe anxiety.
It doesn't sound like that clomicalm worked too well. We often have to give any medication at least a month before we make the decision that it is working but in this case it sounds like it has actually become worse. Clomicalm is a tricyclic anti-depressant so that means we should stay away from this class of medications. Other options include.
1. Seratonin Reuptake Inhibitors: Prozac is probably the most often one of these we use. It is available in a veterinary approved form called Reconcile
2. Benzodiazapines: We often use Alprazolam (Xanax) in dogs in combination with either clomicalm or reconcile. This acts on another pathway.
3. MAOi's: Sometimes the change in behavior can actually be cause by canine cognitive dysfunction. This is a syndrome in older dogs that is similar to senility in people.
4. Thunder Shirts: These you can purchase online and are 100% guaranteed so if it doesn't work, you can send it back. Sometimes these can work wonders.
5. DAP: DAP stands for dog appeasing pheromone. It comes in collars or in diffusers which both emit a calming pheromone that is supposed to be effective in dogs.
So, as you can see, there are many other options and actually they are not that expensive. the next step for me would be to combine 1 and 2 and add in either 4 or 5. If those don't work then try number 3. Again, you have to do multiple different medications at the same time to really see the ultimate effect and we know that, just like in people, some dogs respond better to different medications. And we need to give them about a month to start really working.
I hope that helps! Please let me know if you have any further questions!