welcome to health care magic,
regarding your query it seems that your skin is allergy
to some substance in your lawn like hay flowers or any thing like that...
some one may get very severe breathlessness
due to allergy some gets sneezes depending upon their immune status..you got only body rashes..try anti allergic tab..to relieve this itching..
but finally you have to quit that lawn..
For further working there you may get more severe changes in the body(already said)..
try avoid working there or search new place ...
have a speedy recovery
hope you will satisfies with my answer