Yesterday I did a quick flight from my home airport, XS95, near Victoria Tx, to a small fly in community north of San Antonio airspace. I did not get flight following because it was such a short flight. On my return back home at 5500 feet a 737 passed in front of me (2 nm) while descending and I flew over this flight path with good separation (IMO). To my surprise I hit his wake turbulence and really got hammered (head meet top of cockpit AND stuff went everywhere). Just momentary and really violent. Not expected as I was above his flightpath as I said. Called Departure and they said that because of me, they had to divert a couple of commercial jets (mea culpa, but VFR NOT in controlled airspace). He said NP but recommends Flight Following anywhere near Class C. Just lettin' folks know that: Flight following is a good idea even on local trips and watch out for wake turbulence. Also, and this sucks, my pitch control on my TruTrak quit working after the encounter. Dang (was on alt hold when it 'hit'). Time to troubleshoot. Any input from the collective hive is appreciated.