Potential TW (I don't know how to make spoilers)

Hi everyone! I’ve recently been diagnosed with ptsd and had a question. I’m not an expert in ptsd or flashbacks and was wondering whether if what I’m experiencing is “normal” (for someone diagnosed with ptsd) and if any of you may have experience with this cause I’m feeling pretty alone/weirded out.
A lot of the time when I get very anxious/panicky, it feels like he is standing right next to me and I feel like he is touching me where he did in the past even though there is very clearly nobody there and nobody is touching me. Does anyone else experience this? Is that what a flashback is? I feel kind of crazy If anyone has advice on how to deal with this in the moment that would also be very much appreciated!!!