Attacks after fasting

I hope I can keep this short. Some weeks ago I believe God gave me a message for a church I used to attend. I spoke to my pastor (we have since moved countries) and he gave me the go ahead to deliver the message. I did it but it was only about the third time I had ever delivered a message I had (always just kept quiet because I lacked confidence) and it was the first time it was on such a large scale. I had tested and checked it over scripturally before delivering it just to be sure. After delivering the message I felt led to fast and pray for the church as they were having a meeting to deliberate over what I had said. I did that. However after breaking the fast when I felt released to do so, I have been attacked spiritually non-stop. Mostly stupid little things but enough that it is wearing me down and I am utterly exhausted. I don't have anyone I can talk to at the moment who can pray with me on these things and I am pretty new at spiritual warfare and intercession. I have been trying to fight on my own and have made some progress, certainly, but I really think I need some guidance on how to stand up against this. Is it normal to undergo a backlash when you first begin to step out into the prophetic? Is it necessary to be aggressive in prayer in order to fight spiritual fights or can one just simply state the fact that we have authority and the devil has no power and continue to pray in tongues quietly? I am a quiet, peace loving person - not very aggressive and I am having a hard time with the fighting part of prayer. I have been convicted of passivity and am trying to counteract it but at the same time I am finding it hard to be the opposite of my nature in prayer. I really need some input. I can't join as a student because I can't pay the subscription fee, so any help will be appreciated.