If the symptoms persist or if your vision is abnormal, you should consider returning to the hospital or seeing your medical provider. Sulfuric acid
is an oily substance and may be difficult to wash up
or clear from mucous membranes.
Often, after fainting, you may not feel completely "normal" but by this morning, after getting sleep, eating and drinking plenty of water, you should feel better.
Here is a link that explains more about sulfuric acid vapors: http://www.cdc.