Questions

I have had an allergic reaction to something in the garden of a house let out, on/off for several years. Severe swelling of eye/lips, rash on neck/face, I have been admitted to hospital for treatment due to severity. I would like to get to the bottom of the issue as we are now moving into this house. There is hogweed there but I dont think it is that as have had exposure to that all my life. It is very overgrown at present due to tenancy. Any advice would be appreciated or if you know of someone that may help.