To start generic Fosamax soon and very concerned!

What can anyone share about their Osteoporosis meds......I have consulted with 2 Orthopods, GP, Dentist and Chiropractor. All feel I should try the med.
I am reluctant for some reason, know several that took one dose of their med and had side affects. I was going to start tomorrow morning, Have some busy weeks, in a quandary to say the least.
All 4 DEXA scans were requested by me, only the last one is in the Osteoporosis level.-- 2019 T SCORE -2.7 --in 2014 was -2.3 (what are Z scores?)
Z scores show also.
Please share your experiences with us if you want, the information will be helpful and appreciated by all..
For several years I have taken Vitamin D and Calcium.
I am almost 77 and live alone.. My weight is good, lost less that one inch in height.
Doing my best to be optimistic.
Thanking each of you for input you care to share.