Objection: Healing Is Not in the Context of the Entire Chapter in 1 Peter 2

This is a very similar objection to the one about 1 Peter 2:25, so I encourage you to read the response to that objection.  The main point to get is that Peter is clearly quoting Isaiah, who was clearly talking about healing:

Isaiah:
“and with his stripes we are healed.  All we like sheep have gone astray”

Peter:
“by whose stripes ye were healed.  For ye were as sheep going astray”

See the above-referenced objection for more on this, and for even more proof, see the answer to the objection that healing is spiritual in 1 Peter 2:24.