Hi dogtired, I can't reply on your labs because I am not very good at that. I did take PTU for two years and yes you can go hypo on it. You have to watch your symptoms and bloodtests very closely.
Diarrhea is common with hyper. I know because I had it when I had hyper/graves.
In some people the WBC will drop. If you get a sore throat that won't go away, that will be a sign of low white blood cells.
Do you have a big appetite? I was very hungry with graves. If you go hypo you will gain weight. So WATCH YOUR SYMPTOMS!!!