Value of Future Payments

Hi,My house is single story without basement and nearly 12 years old There was structurally no problem but 5 years ago my neighbor made a 4 storey building with basement just next side by side immediately adjoining to my house after it diagonal cracks started developing on the those walls(load bearing, load is of slab only) which are at right angle to wall which is adjoining to my neighbors structure or you can say on the walls which are at right angle to my neighbors new built up structure .They start from the joint of ceiling and wall(adjacent to the new built up structure) and goes diagonally throughout the wall and ends at the floor almost 10 feet in length and seems(not sure)also cracking the foundation as the crack also travels for few inches in the floor where it ends in the wall. The width of crack in each wall is nearly 1 mm and more wide upside i.e. near ceiling than floor I have repaired them twice in these 5 years every time they were nearly 1 mm wide .Last time I repaired them 2 years ago but after few months they again resurfaced and seems to be widening again. it. Although it is clear that they are due to settlement only .And I have read somewhere that sometimes it takes nearly ten years for the soil to fully settle but I am really worried and so please tell is there any serious problem involved with the stability of wall or what I have to do to overcome or what should be the repairing procedure of it..Although I am also a civil engineer but for Highways so if there is something that I should have to take care of or should be watched please suggest me and I will do that.Thanks