Please relief?? I am not sure what to do here. I live in Libya,...

I am not sure what to do here. I live in Libya, and hold like a big hot wet tank contained by the bathroom. Its called a Sakhana here. Looks approaching a big tank,. Anyway, for the ultimate few weeks its been spitting out marine and making hissing noises, resembling there some gentle of air problem within it, but it was still working ok. Now adjectives that is coming out of the hotwater hit is air and dirty river. Does anyone have any clue as to what i should do. I am on my own and husband is out of the country.
Please if anyone have any suggestions so that i can fix it at home would be great. Thanks in credit.
Answers:    check and make sure that the hose down feed stopcock to the tank is unequivocal. sounds like it,s not getting ample water or none at adjectives.i don't know the unit but adjectives water heaters hold in inlet and outlet tap inlet is normally in close proximity the top. in any defence make sure any valve on it are open ,unless it, s a drain stopcock and that will be on the bottom. and should be closed good luck.