Dear Wornoutmom,
I know where you are! I was there too with very similar issues. I do not know where you are geographically, but I wish I could take your son to try to give you a break!
We did not try any of the psych meds, except the SSRIs which were disasterous. Only thing that helped us was Clonodine which you can get in patch form. I think the psychiatrist would be willing to give you that and I do not think it would be something that Dr. L would object to. I too have not heard Omnicef as an antibiotic of choice.
If you can hold out on the Hospital, I would. Been there and done that. The only benefit was that it said to our son, you cannot do this! But the effects did not last long and all they did was put him on Celexa and Clononine , the former made him worse! We also had no idea at that time that he had PANDAS so you are in a better position armed with that knowledge!
Hang in there! If you want to talk, PM me!
Best,
Brooke