Formula for duplicate referral - same condition or repeat within 30-90 days

Kia ora All

I wish to create a spreadsheet which has formulas which would enable me to see if a patient has had more than one referral created within the next 30-90 days [the actual number of days not important - the ability to modify the formula to reflect which time period required would be cool] and also to see if a patient has been referred for the same medical condition again. Thus in my mind at least two different formulas - has the patient been referred again within a time period of days and has the patient been referred again for the same medical condition.

Attached is an example referral spreadsheet I have created