Dexamphetamine- strange sensations

Hey everyone I'm currently taking 5mg of aspen dexamphetamine 2 times per day. I was diagnosed with ADHD four days ago and have noticed some strange sensations. 

(I take 5mg in the morning usually around 6-6:30am and 5mg at midday) 

Firstly when taking a shower I feel as though the water is very overwhelming. When i spend longer than two minutes standing in the stream of warm water I feel dizzy and begin to take shallow breaths. I have anxiety and while it sounds similar to anxiety it feels different. Im not panicking or afraid of anything in particular and once I get after the shower I begin to feel better.

Secondly I've noticed that sometimes while I'm speaking to someone I'll begin to feel as though in not talking but rather I'm an observer. I can only describe it as feeling like I'm on autopilot. Once I finish speaking I feel as though I haven't just spoken (sounds strange but theres no other way to describe it). 

Thirdly when laying in bed I begin to see distortions in shadows around me. It's almost like they move on their own but remain the same shape as they do when I look directly at them. 

Some people have suggested I may have been dehydrated or sleep deprived but I have been drinking the recommended amount of water and have gotten 7 hours of sleep on average (sometimes waking up 3-4 times a night).

Any help, advice or comments/ opinions would be much appreciated thanks guys.