Hi Chandra, given the treatment you had (where in New Delhi), it is too early to expect full recovery. I see that you had a Neck Dissection - was it RND or SOND? RND is likely to have more severe impact like you are having.

My dad had partial glossectomy followed by CCRT in 2009 and it took over 6 months to recover his speech and adapt to modified tongue. With his recurrence and subsequent treatment, he is again working towards regaining his speech now. Trismus (he is just able to open little over 2 cm) is the difficult part and I have been pushing him for jaw exercise.

Give it time, you'll be alright.