My personal opinion is that waiting until December might be too long to wait--I don't know if you agree--but it seems like that's a long time. I mean, antidepressants take a while for their full effectiveness to kick in, but waiting that long isn't such a great option if you're still having severe anxiety.
Also if you're experiencing panic (and anxiety), the best option is usually a benzodiazepine (such as clonazepam). Clonazepam is not an SSRI.
This is all based on my research I have done for myself personally, so I don't claim any responsibility or medical knowledge. Just what has worked for me in similar situations.
I hope you can figure something out that helps!