How's your energy? If you can stand up, you can put one foot in front of the other and then pause and bring the other foot forward and do so as many times as feels good to you. I mentioned earlier that Safeway has and alternative, cheaper, frozen meal that ranges from 200 to 400 calories and lots of protein in each meal. I could eat three or four of these a day and feel full and satisfied. There are so many choices of entree. You can eat Italian or meat and potatoes or Chinese and the variety is just great.
Use a cane or crutch or walking stick if you don't feel steady. But move. Move, move, move. The activity itself will stimulate your appetite and you may feel inclined to eat solid food. You can walk in place, like marching, raising your knees up as high as possible, and do this while you're watching TV or standing in front of the stove or even outside in your yard or on your patio.
If you still find you can't manage solid food, just keep drinking the protein shakes. Make sure you get enough calories to match your body weight and just keep doing it. I think that appetite is a phase. Sometimes it just goes away. Then it comes back. Most physiological studies show that it doesn't matter if it's liquid or solid, as long as it has enough calories to sustain life. There are probably millions of people on earth who are sustained simply on a liquid diet.
Soup is a reasonable alternative, because even though it is liquid, it contains solids and those are separated out in your digestive tract.
But along with calories, you must move your bones and muscles and feed your organs. If you have this problem and it doesn't seem to go away, you have to see your doctor.
I can't guess your age by looking at your photo, but you look young. That works in your favor, as it's easier to stimulate a young metabolism than an old one.
But don't go It Alone. If you are having this problem for longer than a few weeks oh, you should be asking your doctor for advice. There could be some kind of blockage or even lesion that is contributing to your loss of appetite. Or it could be a serious disease. We can't diagnose you here. I can only share with you that this has never happened to me. If it did, I would be freaking out and making an appointment with my doctor as soon as possible.
Please keep us posted and do consult a professional because I do know one thing for sure: this is not normal or healthy.