A light plane pilot encountered wake turbulence after takeoff behind a King Air; causing some control difficulties.

Narrative

I was departing LBB airport and the Ground Controller that I was talking to was very hard to understand; I had to ask him to repeat himself multiple times. When he informed me to squawk 5111 and departure frequency would be 119.3 I replied; 'Squawk 5111 frequency 119.3.' He then attempted to inform me where to go on the runway which I had him repeat three times. His instructions were to taxi to Lima via Sierra. I then taxied to Sierra via Lima and held short of Runway 17R; which he did not inform me to do. I held short because an aircraft was taking off I then replied 'Holding short at Sierra;' he seemed put out by this. He then told me to change to tower on 120.5 I misunderstood him and switched to the wrong frequency I don't remember what it was; but I switched back and he repeated 120.5 and seemed very frustrated with me; he then made me wait about 3 minutes until the King Air arrived at Taxiway Victor. He cleared the King Air to depart then me. When I was cleared to takeoff Runway 17R I was advised 'caution wake turbulence behind the King Air that I was following.' I replied; 'Cleared 17R caution wake turbulence.' When I took off I was cleared for frequency change; I then changed frequencies to 119.3 and called about 2 to 3 times. My aircraft was very hard to control; I assumed it was the wake turbulence of the King Air; so I pitched up for Vx to avoid the turbulence. I had no response so I turned to my on course heading to avoid any other turbulence and repeated to contact departure. I then decided to look over my flight plan and found that LBB departure frequency was 119.5. I the reported to 119.5 and was informed that I need to report my deviation.