First reply to Judith about replacing your shoes - have you looked online? Or checked with your local running store? They can special order your shoes and get them in your size. And if the model is no longer made, they can suggest a replacement. Try that and see how it goes.
To Camillia - It’s not the shoe, but how you run that makes the difference. Many people who switched to VFFs were either told or thought that you land and load on your forefoot without the heel ever touching the ground. This puts a ton of stress on your metatarsals and if you have been wearing traditional shoes before, the intrinsic muscles cannot support this, because they are weak. Many of these people end up with stress fractures. However, if you are used to your Bikilas, and have been able to run many miles in them without pain, discomfort or injury, you are probably okay. You are definitely an exception in that you grew up running barefoot. Just make sure you listen to your body - any discomfort in the heel (achilles), calves, or plantar can be a signal that you are staying too much on your toes as your foot comes down. Be sure to relax the ankle and let the heel make contact with the ground after the rest of your foot does.
Hope that helps - please keep us posted.
Certified Chi Running and Chi Walking Instructor