Since this is not ADD territory I will respond:
Have you considered these possibilities:
1. The ice cold bath water you ran without adding any hot water has caused the numbing effect?
2. Is your face numb or not (you only said body)? If not and assuming it was not in the water due to requiring air to breath, this might indicate its related to the water somehow.
3. What areas are numb exactly? Everything that was submerged or just extremities like hands and feet. If just hands and feet then you might have vasoconstriction and you should deal with it appropriately (google). If everything that was submerged is effected please refer to point 1.
4. Are you currently experiencing visual distortions or hallucinations due to the effects of the drug you mentioned. Are you certain that your numbness is not a tactile hallucination caused by the drug?
5. If i told you that the numbness was caused by organic adulterants in the drug that consisted of egg sacks for tiny spiders like ant creatures that ate human flesh but first excreted a pain killing venom that numbed the area so as to avoid detection and that is the likely cause of your concerns, would you be concerned and believe me or think i was talking crap?
If you selected concern or belief it might indicate you are experiencing paranoia from the drug with regards to your mentioned concerns and you should not be concerned.
6. What skin color matches most closely to the the effected areas currently? Blue, Grey, Bright Red, Turquoise, Skin Colour, or Teal?
7. Do you have any history of mental health related illness?
Thats all i can think of, hope you are ok? 2cb didnt do that to me, it only made me feel awesome and see great visual distortions and generally love life. You sure you took this?