I have been having more frequent headaches since I lowered my dose of elavil, should I go back to my original dose?

Hello, I have been taking a 20mg dose of Elavil for more than a year due to frequent headaches which are mainly related to muscular pains in the neck and arnold's nerve as well. Since a few months, my pains were really better following conclusive follow-ups with a chiro doing soft manipulations and my doctor had advised me to try to decrease my dose progressively, which I tried to do since 3 weeks by taking 10mg per evening. However, since then, I have had a headache as it has been a long time since I have had any pain. My question: Should I go back to a 20mg dose considering that I have such a headache since then or is it too early to judge the effect?