A single pilot could not load the SRQ GPS 32 approach after the ILS glide slope failed because of the short notice but flew the VOR to a missed approach. Later while conducting the ILS 14 approach he slipped below the glide slope and activated ATC's terrain alert.

Narrative

Inbound for the ILS 32 approximately 7 miles out to SRQ ATC advises that they just lost their signal for the approach. They then offered the GPS 32 for the next approach and gave me clearance to initial fix. It took some time to find the correct approach in IMC. After trying to load the approach 3 times I could not get the correct initial fix to come up. Things were happening fast; so I confessed that I could not get the approach loaded and requested the VOR 32. ATC then gave me a vector to intercept. At minimums I could see that I was not going to break out and requested to proceed south to VFR conditions. ATC than offered the ILS 14 to SRQ. After being vectored and setting up for the approach I intercepted the final. Just inside the outer marker; I descended too low and activated the GPWS. ATC advised and I stopped my decent and rejoined the glide slope. I believe this occurred because I became distracted thinking about the missed approach that seemed possible after all the unsuccessful approaches and other distractions. Moral of story concentrate on the task at hand before thinking about the missed. Also I will revisit the GPS approach on the docking station when I return home to see why approach could not be loaded.