Given the length of time you’ve had your implants and the symptoms you’re describing, it sounds to me that you have severe grade capsular contracture. At the very least, I recommend a consultation with a board certified plastic surgeon who specializes in breast implant revision to get a definitive diagnosis. After a consultation, you can discuss your options. The newest generations of silicone implants are much more reliable than earlier models, and a full removal of the hardened scar tissue surrounding the implants combined with a replacement of new implants is likely to offer very positive results, plus a much more natural look and comfortable feel than you’re currently experiencing.