I was in a similar position to you last year, when I was in my first year of sixth form. I struggled a lot with my mental health and this impacted everything, such as my school work and social life. I was going to take time off but I didn’t. A year on and I am in now a much better place. I had professional help but I think it was mainly down to persisting during sixth form and reminding myself that things will get better.
Are you speaking to someone about your situation? Have you told your college? There isn’t anything wrong with taking a bit of a break from college if you think it will help, but it could make it harder to come back to college if you haven’t dealt with the problems that you were facing there. Just remember, things will get better overtime, perhaps you are still getting used to the demands of sixth form like many others which is completely normal.