Hi Delight. It sounds like you are depressed because of your physical ailments. Are you in college or high school? Maybe you're experiencing normal growing pains with the acne. Have you tried acne products like Proactiv?
Maybe you need to talk to someone about how you're feeling, a therapist. I think you need to start loving yourself and your body and start accepting that your diabetes and thyroidism are simply two more little tasks you have to do to take care of your body and are not disorders that define how you should feel about yourself. Yes, it's easy to say and hard to do, but I understand because I've been there with my eczema (I felt extremely ugly with my bad skin) and now with my depression. These are just a couple more things that people like you and me have to do to take care of ourselves. Taking medicine is just like brushing teeth.
Believe it or not, your self-love will shine through your physical attributes and people will notice your personality more than your physical faults. I know you can let your inner beauty radiate. I hope you'll continue to post so we can get to know you and see your inner beauty.