I think you meant 2 Cor. 12:9...In 1 Cor. 12:9, Paul refers to the thorn as the Greek word astheneia. This word is very clearly sickness when used about sick people being healed by Christ in: Luke 5:15, 8:2, 13:11-12. Luke was a doctor, using a normal word for sickness. It was used in the same way in John 5:5, of Lazarus sick to death in John 11:4. Paul healed people with astheneia in Acts 28:9 (again Dr. Luke using the word). Paul himself uses the word of physical weakness (which was not healed), "weakness of the flesh," in Gal. 4:3. Again, Paul used the word of Timothy's stomach sickness for which he was to drink wine, a medicine in those days, in 1 Tim. 5:23.
What about Romans 8:26? It was not always limited to sickness when King James Bible was written. Notice the colon after the word "infirmities" and again after the word "ought." This verse is saying that it is an infirmity to not know what we should pray for as we ought. If you were to look up the word infermity in the dictionary, you'd find that it not only means sickness, but it could also be any wekness or inadequacy. This is how it was used in Romans 8:26. Not knowing how to pray for something is a weakness, an inadequacy, an infirmity---not a sickness or a disease.