Advice- long commute to work

For my job my area is 2.5-3 hours away. Now I work from home one day a week and have one close office of 40 minutes I got one other day a week. The other days I have to travel, I used to just stay out of town 2-3 days per week to save on my drive. We also used to fly to out of state for 3 days a month but that's on hold. Im at 20 weeks and the drive is rough. Mostly I get so tired, few times I've had to pull over to nap. It's long days! I tried mentioning my concerns with my market distance before to my boss and it was kind of blown off. I have a apt next week with my doctor, I know they mentioned every 2 hours getting up and moving, but that makes the trip longer. Frustrated and concerned. What have you done? Doctor recommendations? Advice?