[SELF-ANSWERED] 2D Z axis rotation - need to clamp it -90 to 90 degrees

I am working on a 2D top-down shooter, and I ran into problem I've been confused over all day yesterday.

So I'll start off with a video I recorded:

So what do you want to do? I have character changing sprites every time it changes direction (WASD) and I want character to aim his weapon at mouse position, but I want to clamp it so it does not rotate all the way around, just the direction its facing, easy - use mathf.clamp, but I've ran into really annoying problem, which I'll explain below.

What do you want to show in that video? Please pay attention to Z axis as I rotate weapon with mouse, Z axis suddenly turns negative after 180 degrees, now I am pretty bad at this kind of math so sorry if I am asking something pretty stupid, but why?

Whats the problem though? Well, I cannot find an easy way to clamp it correctly if it suddenly turns negative for reason I don't get.

I'll try to show parts of my code now, its extremely messy though, yesterday I tried everything I could ever think of so...

The mouse-rotation part:

Code (csharp):

1.  
2. Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
3. mousePos = mousePos - cw.weaponHoldPosition.transform.localPosition;
4. angle = Mathf.Atan2(mousePos.y, mousePos.x) * Mathf.Rad2Deg;
5.  
6. cw.weaponHoldPosition.eulerAngles = new Vector3(0, 0, angle);
7.  

I honestly remember using some different method which gave similar results before, but after digging through google for hours I ended up using this.

Part of clamping in case if last direction is on the right facing side (Which in fact works I believe, its just other sides that are messed up due to me not understanding how these kind of angles work):

Code (csharp):

1.  
2. angle = Mathf.Clamp(angle, -90, 90);
3.  

So, can I please get some suggestions on how to fix my problem? What can I do to get this working? Also, if I left out something or explained something poorly, let me know, I will correct it.

Thanks for reading!

 

Alright then. Even though I tried things VERY similar things to this yesterday, I didn't realize I could simply do this:

Code (csharp):

1.  
2.         if (cw.weaponHoldPosition.transform.eulerAngles.z > 90 && cw.weaponHoldPosition.transform.eulerAngles.z < 270)
3.         {
4.             cw.weaponHoldPosition.GetComponentInChildren<SpriteRenderer>().flipY = true;
5.         }
6.         else
7.         {
8.             cw.weaponHoldPosition.GetComponentInChildren<SpriteRenderer>().flipY = false;
9.         }
10.  

It flips the weapon so its not upside down and allows you to do 360 weapon rotation, but it actually looks normal this time.

Guess sometimes you gotta stop being nervous, I could had fixed this yesterday if I would stay calm.