sorry to hear this about your dad,i suggest you phone parkinsons help line at top page.sorry i can not suggest anything else,i hope he gets well !
I'm so sorry to read about the difficult time your father has been through.
We have some information about swallowing problems here: http://bit.ly/1OUVpvJ
As gus already mentioned, please do give us a ring on 0808 800 0303 (Monday-Friday: 9am-7pm, Saturday: 10am-2pm) if you'd like to discuss your father's situation.
Ilona (Moderation Team).