I would see if the college has a counselor or a learning specialist on hand. The most important thing, imo, is being proactive. Think about your classes and about which ones will be the most stressful. If you know for instance, that science is difficult for you and takes you longer to finish your homework assignments, that can help you plan how you manage your time outside of class. A counselor or learning specialist can be a lot of help even if you don't have a diagnosed LD. I know my school learning specialist is always happy to meet with students to help them plan their afterschool schedules, help break down a large assignment, teach them study techniques, etc. It might be worth a shot to see if there is anyone like that you might be able to be your advocate and help you settle back into the school routine.