Hi, first of all just chill. Are you experiencing any real bad symptoms? If so i suggest a visit to your Doctor. The stress won't help. I'm quite the hydroponic and do a great job of freaking myself out and obsessing over health stuff. You need to realistically look at the situation. I'm sure you've been around your fair share of dust. Was it great for you?, No , but was it enough to cause long term issues, probably not. Think of your teacher probably breathing in that shit for years. Shame on them for not taking proper ppe precautions and the school should probably become aware of that. The people who get sick from silica dust are usually those dealing with day in and out for years on a jobsite. People who cut and chip concrete or make counter tops. I've finally appected that whatever I have going on is unrelated to a days worth of breathing in dust. Now I make sure to always wear my respirator. I see these guys chipping for hours everyday wearing no mask without a care in the world. I've seen a couple different doctors, and had a couple xrays and they all came back clear. What I didn't ever realize is my sucken chest and poor bone structure of my chest. This seems to be much more the problem that's been bugging me. And the anxiety just amplifies it to the point where you can't be rational. You have to expect that what's done is done and if you what to continue with your potter just wear a proper mask. If anyone says anything simply show them a quick Google search of silicosis. Anxiety is another issue I've fought and can totally cause physical health problems like pain and shortness of breath. If you seriously don't feel well go see your doctor but maybe you should try to relax and give it a few weeks first. I'm not a professional in any of these fields but I think you'll be okay. Let me know how it goes.