Anxiety, panic attacks, overstimulation, and anger issues

can someone offer me advice on coping with anxiety, panic attacks, and overstimulation in social settings or public places? I've struggled with these for years but only recently did I recognize and name these experiences. 

whenever I feel nervous or scared my hands, feet, and armpit get excessively sweaty which embarrasses me and worsens my anxiety. in school, I sometimes become extremely self-conscious, often looking down while walking to avoid drawing attention, getting looked at gives me anxiety. In class, I'd sometimes feel my blood rushing, and my breath growing heavy and as soon as the period ended I got an overwhelming urge to rush out and go home. I really miss the feeling when my body feels so light, and my mood so good because I have more bad days than good days. I would only know what kind of day I will have when I step onto the campus, my mood is so unpredictable. 

One instance that stuck with me was when I accidentally left my hanky in the classroom, I was a new student then. I quickly walked back to retrieve it but before I could reach the room a classmate spotted me and joked "You forgot something? :) Is it your handkerchief?" (whenever I feel awkward I just smile or laugh like I'm the goodliest person and I hate that quality of mine.) So I managed to smile and confirm, and she replied, "You left so fast! haha" Although she was nice and friendly I felt panicked inside. 

during anxiety or panic attacks, I become very quiet and may snap at others, even if they're not doing anything wrong, I'm just extremely sensitive to everything, especially when I'm overstimulated.

can you share with me any advice or personal strategies that worked for you in these situations, also I just recently heard of overstimulation and I feel like I'm overstimulated at school with my blockmates and in our house with my mom. It's ruining my relationship with everyone. I can hide my anxiety and panic attacks by running away or being quiet in the corner of the room, but being overstimulated I just snap I'd call than an anger issue sometimes my reaction and emotions don't make sense.

I'm overwhelmed by pent-up rage from being misunderstood, constantly battling anxiety, panic attacks, and overstimulation. Despite these struggles, I believe I'm a good person although I am more bad than good because I'm having more bad days than good days, and maybe my anger issues are simply the product of everything. I'm really trying to change, I'm constantly trying things that would help me not just physically but also mentally to be emotionally balanced. 

I still have a lot of things I want to share to explain everything I just wrote but this is it for now. hope someone can share their thought. Till next time! :)