While this article is on retirement, many of the suggestions would apply to your summers:
Can you give yourself some structure? Every day at 10 am you go to the gym. Or Mon, Wed, Fri afternoons you do something creative you like (such as painting or crafting or sewing or …)
Penny
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism