Thanks for the query to H.C.M. Forum.
There was excruciating pain in the back .
Due to excruciating pain patient feels syncope
like symptoms and due to this there develops difficulty in breathing and walking.
Heart beat was 119 & Blood Pressure 116/78 mm of Hg.
were given , but same time you got rest , so both things cured you.
In my opinion , no doubt heart rate
was very fast, but may be due to pain and tension .
Main cause of concern is pain in the back.
May be a muscular pain
In my opinion please wait for sometime , if pain reoccurs than consult an orthopaedic surgeon
and get his opinion.
Due to strain or spasm , sometimes this type of pain may occurs.