Don't know what your opinion is of micro pilots, but I'd suggest a trip down to the local micro strip and share a few stories with the microlighters. Forced landings are a much more frequent and real possibility every time you fly and the micro boys seem to deal with it in a very philosophical way.
Take a guy from our local Club who bought a Kolb not long after qualifying for his license - he came down in the circuit on his second flight due to fuel starvation and wrote off the a/c. Undeterred he went out and spent £30K on a Jabiru less than two months ago and just as his confidence was getting back his propellor disintegrated 1500' over North Wales last week-end. How this has affected him, I don't know, as I haven't been to the Club this week.
Your issue, is not in your ability - you clearly handled your engine failure extremely capably - the problem is a loss of confidence in the aircraft and the never ending 'what if' scenario - if you were over a foresty, if you were over mountains, the sea etc etc.
All mechanical devices are prone to failure - manage the risk that you take and the confidence will quickly return. Always planning flights over water, forests & built up area's will do nothing to alleviate your anxiety.
Personally, I think you did a marvelous job and that should give you confidence to handle any other in flight emergency.
Tony