Struggling to Understand ADHD and ASD Symptoms

I'm struggling to understand if I have ADHD or ASD or both. I get sensory overload in loud settings, when multiple conversations are going on at once. I do a lot of stimming (singing to myself, biting fingernails, twirling hair, tapping, etc.) My mind races with anxiety and worst case scenario thinking (especially at work and high pressure settings.) I often feel misunderstood and like I'm unable to fully communicate confidently. I have a hard time finding motivation. I'm very sleepy more than most people. I want to try and have a better idea of what I'm dealing with. Any advice would be incredibly appreciated! ♥️