Hi rinpin_05!
I want to start by letting you know that it is very normal to both experience arousal without a specific “prompt”, especially as our bodies are going through puberty. Orgasming during sleep is also totally normal and common for people of many ages. (When we sleep, our bodies are very relaxed and there is more blood flow to the lower half of our body, so it makes sense that we would orgasm more spontaneously or without intention). So I wouldn’t say that these would be representative of PGAD if that makes you feel better! I think the big distinction is that for PGAD, the physical symptoms are very uncomfortable and unrelenting, not just spontaneous.
I am bummed for you that what you are feeling is detrimental to your everyday life, though! Do you mind sharing more about what makes you anxious about your sexual arousal? Then maybe we can talk through some ideas for managing these anxieties