I think that it can get easier, but that depends on some things.
1) Does the child have a severe enough issue that he needs extra help? I say that because some kids who are explosive (such as mine was last semester) can learn to handle that part of their character and slowly make progress with a lot of support and sometimes medications. Others need much more support and this could be a constant struggle. Everyone here will recommend an evaluation be done. I think it's a great idea, because it lets you know what you're dealing with.
2) Are you flexible and willing to try different strategies? Honestly, my 7-year-old boy had me tearing my hair out. I couldn't take him anywhere. The tantrums when the sensory issues kicked in were awful and nothing I did seemed to make any difference. Now, with the help of a behavior therapist, we have a behavior plan at home that is giving me room to breathe, that has eased some of the stress between my SO and I, and that the children seem to be responding to. But, I don't know if this will work three years from now, I just know I got a breather for now.
3) How big a support system have you established for yourself and the child? As I said, I have a breather, but that was after contacting: gifted advocate, behavior therapist, Occupational Therapist (OT) (at school), sped teacher(at school), psychologist for child, family friend who used to be child psychologist, this board, a gifted board, and the principal. I have to constantly make sure the right people are talking to each other, but when they do my job gets a bit easier because there are professionals saying what I, as a mom, cannot say with authority. I also have to constantly watch the boards and ask questions so that I can learn about options I never considered.
There are probably more factors than I can write up here, but I think for me, these are the main ones that help today be better than three months ago.
I hope this helps.