This dream is a few days old now so the meaning may have faded for you. I feel that you've already figured out most of this dream for yourself (past, present, future) except for the part about the weights. You've focussed on this a lot in your description. What does the weight mean to you? Is it simply a representation of your body weight, or a play on the word "wait" or something else. Do a free association on this symbol and see what you come up with. My guess is that the
"we" in look how far we've come, refers to the three you's (past, present, future) but only you know for certain the feeling in the dream whether it was you or communal. Try a free association on "bell-tower" as well as that's how you described where the weights were. Also, try to think of where you've seen these weights before (in school, at the doctor's etc) and see if there's an association there.
Don't worry too much about this dream but look out for dreams that follow, which may make this one clearer. You may get an explanation in future dreams, especially with such a strong time sequence.
Hope this helps!