Q I get very nervous when flying, and whenever I get that worried, my blood pressure goes up a little. Is this normal? My doctor said I should not worry about it because that is due to my anxiety. I do take Xanax when I need it, which is not often, but should I take it for flying?

Dr Jules Eden replies: Blood pressure always rises due to anxiety - the result of an increased heart rate. But help is at hand with all the medications used to treat anxiety that can also be used before flying. Xanax, a member of the same pharmaceutical family (benzodiazepines) as diazepam, is a strong one. Take it about two to three hours before you fly, and do not mix it with alcohol. There is a risk of dependency, though, with these benzodiazepines, but only if you are taking them more than once a week. Another alternative is a beta blocker. Propranolol at a dose of 40mg slows down the heart enough so you don't get those anxious palpitations that often worsen a fear response. It is non-addictive but should not be taken by asthmatics because it will constrict the lungs.

Q I've recently found that prolonged flights trigger sciatic pain, which doesn't ease for weeks afterwards. Can anything be done to prevent this, or to relieve the pain more quickly?
Andy Mitchinson

Dr Jules Eden replies: It sounds like your lower spinal position in-flight is pinching the sciatic nerve roots. I suggest you learn some exercises from a physio to use during the flight. It's also best to get up every hour or so and flex and extend your lower back. Simple toe touching will be sufficient to loosen you up.

Ask the flying doctor If you have any questions you want to ask Dr Jules Eden, email travel.doctor@theguardian.com, or write to The Flying Doctor, The Guardian, 119 Farringdon Road, London EC1R 3ER.