Once you rule out physical problems, Ear aches, also her hearing and her sight, then you need to move on to ignoring her tantrums.
Ear plugs help take the edge off. purchase a lot of them and have them up high and around the house.. Keep them in the car and in your purse.
Remember her attention span is about a minute, 2 at the most.
And make sure there is a place for her to be safe while she is having these melt downs. Her completely childproofed room with the door closed.. Or in the car, while the rest of you wait outside of the car and not in her eyesight,
And then you need to learn to recognize when these melt downs are about to happen or to avoid them..
She does not have the verbal skills to tell you what she wants or needs and so you need to figure out what is going on and give her the words.
"I can tell you want that cookie" (in the future do not have them where she can see them) "How about some crackers or some applesauce?" While moving the cookies away from her vision. When she makes her choice say "Good choice".
Time to put on her jacket and she fights you.." Ok you hold the jacket and I am going to put your boots and hat on first. Thank you for holding the jacket." "Do you want to put the left arm in first? Or the right arm in first? "(Touch her arms while you say this.. meaning her right arm, her left arm)
Another option with jackets, pants, ect.. Is to have her turn away from you and then touch her shoulders. while saying left or right, . Or Having her look away at something else. Quickly say, "Hey, What is that out the window? Is that a dog walking with that lady? "
"We need to wash our hands! Help me wash my hands. Lets share soap." Rub your and her hands with soap. "Ok lets rinse them off! You both rinse the off, you helping her. Then ask her, where is the towel? Thank you for the towel..
You get the idea.. Yes she is 1 1/2, but she is always watching, hearing and learning. If she is made a part of this stuff, she will feel like she has some control.
Options for a child this age are pretty easy. Acknowledging her feelings with your tone will also give her the words for what she is feeling, Giving her time and some distractions, take a bit of planning but the are worth it.