It is a good habit of doing gardening in summer..! But nothing will happen to ur eyes with that small amount of dirt.. It ll be relived by normal eye drops like clearine or refresh gel drops.. And the viral fever
which u got is no where related with ur eye problems..
The burning micturation which u r suffering is might be due some side affects of drugs of viral fever..or else most people suffer burning urination when they take less amount of water and spending more time in hot sun..
So.. Worry not about ur health...drink plenty of water and have vitamin.c rich fruits and finally start using safety glasses for. Ur eyes while working in garden....