Hey Fish along, it seems to me your joints are going. It sneaks up on ya without warning.
I'm 69, and I need both a knee and hip replacement. Double whammy.
They both happened suddenly outta the proverbial clear blue within a month of each other, last September.
Get to your doctor NOW and explain what's going on so he can refer you to the Hip and Knee Clinic right away - or whatever clinic is appropriate.
The wait-time is currently "forever minus a day" and I'm still waiting for my replacement surgery. I got an "acknowledgement" from 'em, but nothing else.
In the meantime take whatever pain killers your doctor gives you, although I found 4 aspirins a day and glucosamine work best. I'm currently on crutches and a walker.
BTW, those "injections" don't work for me, but they might for you.
Good Luck!