DP includes physical findings. My grandmother would collect the "bugs" to try and show us. In her case we took her off some meds and the dr gave her some to treat the dp symptoms. We had to tell her the medicine was for getting rid of the bugs because she refused to take it when we tried to tell her the truth, that there were no bugs.
See her doc knew what was going on and changed the meds. I realize some folks will always insist there's something else going on. In general normal folks can have these syptoms from small muscle contractions in a wave motion though the skin, or just traveling waves of adjacent receptor firings. If the meds hyperpolarize certain nerves, or muscles, or change change transmitter concentrations, they'll have the effect of causing these things.