Feeling very tired is a side effect of having hypertension.
You are asking about relation between hypertension and breast cancer.
Hypertension doesn't raise the risk for breast cancer directly, but, having greater body mass index scores in conjunction with hypertension is linked with greater risk for breast cancer.
Some clinicians think that certain anti hypertensive drugs have a malignancy potential.
This pain and lumps felt in your breast can be changes due to fibrocystic condition, that may affect only one breast and its symptoms are usually more prominent premenstrually.
Chest x-ray isn't indicate to detect breast changes.
Mammogram is an x-ray for the breasts.

Best wishes!
Marija