My 2yrs 2months old son accidentally ate calamine diphenhydramine hydrochloride and camphor lotion...any problem plz rly?

The amount ingested would determine the risk. I would contact a poison control center and discuss the issue with a specialist. In the US we have a universal # at 1-800-222-1222. There may be something similar in your country. If not take him to the emergency room where they can sort out the details.

Please also consult with your Pediatrician. Watch for signs of shortness of breath, lethargy and poor feeding. The local pediatric clinic is another source of information. Keep all small objects, batteries and harsh soaps and chemicals out of reach and in a locked cabinet.