I would like to travel to Domme but would like to no if i will be able to get by speaking english
You will do fine in Domme. Recommend you stay at L'Esplanade. Fabulous food, nice family and centrally located hotel. Your meal will be memorable.
English is very widely spoken. Using at least a minimum of French (hello, please and thank you are really not that hard) is polite.
No, English is not widely spoken in Domme. You will find some who do speak it, but you absolutely cannot assume that everyone will.