Well loss of taste often occurs to smokers and drinkers( specially if not diluted sufficiently well enough) so immediate advice would be to stop these two and khaini , paan, paan masala or any such addictives. Avoid too hot and too much peppery food, or too much of mint. It should be normal withing 3-5 days..
Health Tips
do check with other family members if they are having the same problem. if so then you may have the batch of salt to blame..