I don't think it's diabetes related, since you had blood tests and nothing was found. I presume the tests included blood glucose or HbA1c, which would indicate the presence or absence of diabetes or prediabetes. You might want to ask for a copy of your test results to be sure.
The kind of leg pain you describe, if it was diabetes related, would only occur after someone had been diabetic for some time.
I suggest you see a physiotherapist about your shin pain. They might be able to help you work up to activity gradually to avoid irritating the area.
I suggest having an annual blood test for diabetes, since you have high blood pressure, as the two can be related. Are you in the normal weight range for your height? That is one of the best ways to avoid diabetes, along with avoiding abdominal fat. If you want more advice on how to avoid diabetes, let us know.
If your blood pressure is above a certain level, then taking medication for it can protect your kidneys from damage. Most people with high BP are unable to reduce it without medication. If it's only at a pre-hypertension level, then ask your doctor how often you need to get it checked. My guess is at least yearly.