Hi. Although your androgen (male hormone) levels are normal you are probably very sensitive to their effects. You could take an anti-androgen contraceptive pill like Dianette (Diane35 in the USA).
Rather than shaving, have you tried facial hair removing cream? It will be a more pleasant experience for you, and the results will last much longer than shaving.
Laser treatment carried out at a skin clinic can permanently remove hair. Many clinics offer finance or a discounted rate if you book a series of treatments.
You are not alone. I have the same problem. Maybe worse because it's not only my lip but also my chin. I have had a laser treatment done. I thought it would work but they said I had to go for another treatment in 4 to 6 weeks. Well after that long, i just could'nt get myself to go back. One piece of advice that i can give you is, Tell your husband! Seriously. I felt soooooooooo much better when I told mine. Now he understands why sometimes I pull away, or why I won't let him touch my face. It might bond you two more than you know. I'm going to try that anti-androgen pill, and also I've heard good things about Vaniqa cream.
I suggest that you should refrain from shaving facial hairs. For one it may cause pseudofolliculitis barbae which may lead to itchiness and excoriations. If this has been present for a long time and your hormone levels were also noted to be within normal levels, I suggest that you have this assessed by a dermatologist.
At this point, I suggest that a laser hair removal procedure may benefit you. Firstly because this occurs on the face and certain medications may not be easily used on the face. Also, repeated shaving and tweezing may only irritate the skin and the scars and excoriations that may complicate these are definitely not welcome.
Discuss the advantages of laser hair removal therapy with your dermatologist. The laser sessions may be done repeatedly depending on severity and extent of the condition.