You are carrying 36 wks pregnancy
and near to deliver your baby.
In this time,tingling/numbness
around vagina along with LBP is quite common.So don't be much worried.
You may use Muscle relaxant
gel for backache/LBP with VAGISIL cream around vaginal reg to get some relief. Maintain genital hygiene properly.
Do check up to your doctor for assessment of current pregnancy status and need some examination.
Take adequate bed rest
with left lateral position, take healthy diet,avoid sex and heavy work.