Do I have SPD?

I'm a 24 year old female teacher who believes she may have SPD, or at least some form of sensory issues. I constantly cover my ears without thinking and the sound of the oven timer beeping makes me want to scream. I can't handle the sound of nails on jeans and I can't have things like watches and bracelets touching my skin. Loud unexpected noises make me want to scream and they raise my anxiety. Forget fire drills at school-I practically have to make my palms bleed to stay calm in front of the students! There are more details of my life that fit multiple SPD checklists but I'm wondering if I should go about getting diagnosed. I'm almost 25 and I've made it this far...should I try to get diagnosed or am I being paranoid?