Rapidly changing hair behaviour

My hair seems to change the way it grows. Sometimes it will be over a week, sometimes a month, there seems to be very little consistency.

At one point, for instance, the roots at the side of my head grew straight downwards, causing a general thinness. At the present it has begun to grow sideways towards the back of my head, pushing everything outwards and causing a very spherical look.
The roots at the top of my head are also currently growing straight upwards, causing some strange looking curls. This is not even consistent along the hair line, certain "sections" of hair will be bunched together and growing at a different angle entirely (Not properly depicted):


My hair is thin and mostly straight with a slight wave, but depending on how it behaves it can take on very differing appearances. Also because the issue seems to be at the roots, it's very difficult to manage or alter.

I'm really quite lost in all of this, having little knowlege regarding hair. I would greatly appreciate even a simple comment on this, and considering I am new here I am apologetic if this question has been answered elsewhere.