First of all, you are already doing awesome! You should be proud of yourself that you've made it this long and remember, however long you do nurse is always better than nothing!
My son is 13 months and we're still nursing although I'm starting to wean. He was exclusively breastfed his first entire year and I work full time and went back to work when he was 12 weeks old. I pumped 3 times a day as well and always tried to pump at the same times every day. I found that usually I would pump more in the morning and less in the afternon, therefore, I would try and pump maybe 15-20 minutes in the morning and by the afternoon, specifically later in the week, I was usually not pumping more than 10 minutes. I always did a 30 second relaxation routine before pumping. I would take out a few pictures of him and think about him nursing that morning. I would also try and make sure the room I was pumping in wasn't too cold. And I tried to put away all thoughts I had of everything that was waiting for me on my desk. Since I couldn't be with him, this was my way of being close to him while at work.
I know it's tiring, but nursing constantly when you're home is the only way you'll be able to increase your milk supply. Your body works on supply and demand. Although I wasn't waking up in the middle of the night much to nurse, I found that the nights I did wake up, I truly cherished those quiet moments that he and I had together, just the two of us. It was my down time and my quiet time, just to reflect on how wonderful my life was now.
I don't think your body is telling you it's time. If you want to continue nursing, you can! It's not easy to do what you're doing...but if you're committed about doing this for your child, then stick with it. It is so rewarding and you are benefiting your child so much!
Congratulations on making it this far and keep up the great work!