What is the best hay fever medication to take for really bad hay fever allergies?

I have suffered really badly for years with hayfever and have tried all anti histamines steroid injections and desensitization injections also! a friend of mine also suffers badly and was given mizollen last year with great results. i have used it this year alongside a top dose of flixonase and am absolutely symptom free so far even with all this great weather. so i would highly recommend mizollen which is only available on prescription and flixonase 2 puffs up wach nostril twice a day. hope this is helpful