Lymphedema and needles/blood pressure on the affected arm

I had 17 lymph nodes removed too, and I have lymphoedema in my left arm. In general, it is best not to use an affected arm for injections, blood tests or blood pressure, to limit exposure to infection but it can be done. If your lymphoedema is mild or occasional, it may be quite possible without much risk. For your own peace of mind, you might consult a good lymphoedema therapist, who can probably advise on what to do before and after to minimise any adverse outcomes. Best wishes.