Did you guys know that studies have shown a positive relationship between shoe price and injury frequency + magnitude? The more expensive the shoe, the more likely you are to get injured from it. I also recall Sunny S saying he got planter fasciitis at some point, so maybe it's the shoes that you're wearing.
The reasoning behind it is that the more expensive shoes do all this cushioning, over-compensating, etc. when you run instead of letting your body adapt and get stronger to the impact. FWIW, I used to be a decent cross country runner and I had to stop because I had flat feet, shin splints, and excruciating lower back pain from running. I had to quit but started again this year...I bought Nike Lunarlons for running and threw my back out for 3 weeks when I decided to try running again (for anyone in the running thread, it was that time when I ran the 5k in 22 minutes without training lol).
I've since switched to Vibrams and I finish in the top 10% of any race that I enter without training. I no longer have lower back pain, my flat feet now have a bit of an arch, and I've forgotten what shin splints feel like.
YMMV, but I stand by shoes with minimal cushioning (I run races in $30 nike tiempo soccer shoes while my Nike Lunarlons and New Balances collect dust). It did wonders for me, so it could be something to try. Having said that, running will always be a high impact sport so I can see why people get all this cushioning and technology...but our legs and back are our natural suspension system - it seems like we need to let our bodies do their jobs and fine-tune itself by putting it under stress.
edit: also +1 to toshison except I hate the direction that the shoe game's gone. I used to be a shoe head and I've stopped buying nike (other than their indestructible soccer shoes). I remember when goodfoot used to be a well-kept secret.
People paid good money for these lmao: