Struggling to parent while husband away....

Apologies in advance, this might be a bit long. As a bit of background, I am a military wife and my husband and I have one child (boy, almost 7). My husband recently moved states due to a military posting and I chose to stay put for a number of reasons, my job, child going into year 1 at school, family only an hour away and moving with husband pointless as he would never be there anyway. This is not the first time we have done married/separated however the last time was when our boy was a baby so he was not really aware of the absence as such. My problem/concern/worry is that I am failing as a parent. I work full time in a very stressful busy job which I love, however since our son started school again it has all gone pear shaped, he is not participating in class, not finishing work and to top it off he is lying to me about what he has and hasn't done. I know I should not be too concerned as he is just getting back into school and it is only grade one but for some reason I am devastated that he is lying to me about it. We have had the same conversation for the last couple of nights, he apologises, promises to try harder and we both end up in tears and move on. Tonight however was different, tonight he lied to me three times before I caught him on one, and my reaction to say the least was not great. His room is now stripped bare of teddies, toys, pictures etc and he was sent to put himself to bed as I just could not face him, I am heartbroken that he has lied but even more so by my reaction, even as I write this two hours later I am sobbing. When I explained why I had removed everything he was more upset about loosing his favourite teddy than what he did wrong, I just am so upset and have no idea how to move forward. I want to go and wake him up to hug him and give him everything back but can not bring myself to do it. I can't talk to anyone as I feel like an absolute failure and I have no way of contacting my husband except by email and if there is one thing I do know when you are a military wife is that you don't send emails when you are upset/angry, there is little hubby could do from where he is and it just compounds concern for him. Please note that in all of this our son does not vocalise that he misses dad as an excuse for the misbehaviour, he simply says he does not know why he does it. Any advice from anyone else who has gone through this would be appreciated.