I don't generally believe in rushing off to the chiro / doctor but if it's "take my breath away" pain then you'd better see someone.
This could be a local problem, like a muscle strain, or capsular strain of the hip join, or referred pain from the sacroiliac joint or upper lumbar spine.
If the pain is mainly when walking, then I'd think of something local in the groin. Unlikely to arthritis or an impingement syndrome with sudden onset like this.
See if you can work out what relieves and aggravates the pain.
Any back pain? Maignes syndrome
is a referred pain from the back to buttock and groin area.
Look up Femoral nerve too on the Search this site …
Meantime, be careful; do some gentle hip and lower back exercises, and perhaps you'll be lucky and it will settle.
Child rearing years are hard. Lots of lifting... probably related to moving kids about.
Good luck, sorry I can't be more specific. Let us know in a few weeks how you are getting on. Keep to this thread. Find a good chiropractor
may be your next step. Go from Groin vaginal acute pain to Chiropractic Tips …
I hope this has contributed.