Feel ya. I did the same thing a month ago with Hex Bar Deads. Wrecked either my Erectors or Multifidus. All it takes is one rep (or preparatory positioning?) with poor form to ruin your weekend. Necessity drove me to tinker a topically applied solution to assuage the LBP.
Apothecaried a mixture of DMSO, Castor oil, CBD oil, Peppermint oil & Frankincense oil.
The CBD, Peppermint and Frankincense are all natural analgesics. The DMSO and Castor penetrate barriers and facilitate absorption.
Viola!
I and the fam have since applied this elixir to sore muscles and aches and owies to efficacious effect.
Of course, this in no way should be construed as medical advice, just one aging meathead's own experience. YMMV.