Had Contact Ulcer on my Larynx. To do.

I got pain while speaking and got a hoarse voice 2 years back. Doctor told me that I had Contact Ulcer on my Larynx and got treated for it by an ENT doctor, the doctor prescribed Voice Rest and some meds for the Ulcer to heal. In like 4-5 months the pain got less and the ulcer healed, but I had heard that these can come back again. Now since 2 months I started working in a BPO company where I had to talk to customers for like 6-7 hours everyday. For 5-6 days I feel my throat to be heavy and my voice hoarse and strain while I speak again just like before, I have a deep voice so it already takes much of my energy to speak for that long and I am worried as I suspect that if I keep speaking in my job my pain will increase and I have to go through the whole treatment again. Please tell me what to do.