hello loss of taste sensations is unrelated to gall bladder surgery or application of any antifungal cream............. common causes of loss of taste are- GERD mouth infection poor oral hygiene radiation therapy salivary gland infection sinusitis sjogren syndrme tobacco use vitamin b 12 deficiency, glossitis, zinc deficiency oral candidiasis are other causes of loss of taste i think if you can do it then please consult a dental surgeon or even a general practitioner to actually find out the cause of your loss of taste and proceed with the treatment accordingly hope it helps