I'm new to gardening and this is my first time growing a tomato plant. For the past couple weeks my tomato plant has slowly been turning yellow from the bottom up. I thought it was because it was the plant was trying to produce fruit ((albeit there is only one lil tomato on it)) but the leaves started getting grey splotches on them which made me worried, but I chalked it up to over watering. In the past couple days I've noticed lots of tiny black dots on the leaves. A couple leaves have thinly blackened around the edges. And at least half of the stems curl downward. Does anyone have an idea what could be going on? And is there anything I can do to save the plant? Thank you!