Leena,
Although I am usually an impatient person, I learned a lot of patience in the months after radiation and chemo ended. I advise against rushing back to work. Fortunately I am self-employed and I would go in 2 to 3 days a week for just a couple of hours, but there was no way that I could have put in a full, productive day of work in the months following radiation. I used to spend a lot of time drifting to sleep in my easy chair at home.
Six months after treatment, my throat had still not fully healed and I was still wearing a PEG tube 10 months after treatment.
But, in time, most of the problems pass. The PEG goes, the energy level increases, you begin to gain weight and feel good....and before you know it , life looks well worth living again.

Keep the faith,
Danny G.