Hi
If India is really where you want to go, just go for it! You won't regret it.
My first ever JY trip back in 2005 was to India and I was somewhat nervous but it was to become one of the best things I have ever done. I have been back a few times since and currently have two more of the JY India trips booked.
Regarding the weather after being in India in October and February I concur with Hils and Lesley about the weather.
Food wise I always eat vegetarian in India, but I have no idea about gluten free. The hotels in India are of a very high standard and there is always plenty of choice with food.
The JY Tour Managers are invariably very good and you will be well looked after,this goes for any JY trip. So should there be any issues about food when you arrive at hotels, the Tour Manager will do his/her best to sort it out for you.
Kind Regards
Di