It's not quite at simple as that. For example, Units 1, 2, 3, and 4 are all external (i.e. examined) units, yet Unit 1 is 90 guided learning hours (GLH) whilst Units 2, 3 and 4 are 120 GLH. This means that getting a pass in Unit 1 gets you between 9 and 14 points (depending on whether you just scraped the pass or whether you were on the verge of a merit), whilst a pass in any other of the examined units gets you between 12 and 19 points. Similarly, whilst Unit 6 and all the optional units are 60 GLH (meaning that a distinction earns you 16 points), Units 5, 7 and 8 are all 90 GLH (meaning distinction earns you 24 points). We need all these points to add-up to 176 for a DMM.
You said, "I’ve gotten 3 passes, 1 merit, and 4 distinctions" (that's 8 units) and then later "in my exams I got passes and one near pass", so it's not clear whether the near pass was in addition to the 8 units you've already done, or whether one of those three passes was actually a near pass. Below I've tried to mock-up where you might be in terms of an overall grade. I've made a lot of assumptions:
1. I've assumed your optional units are Unit 9, 10, 11, 12 and 14. (The lack of Unit 13, which spoils this sequence, is because that belongs to "Health and Social Care (Health Studies)", not straight "Health and Social Care". It doesn't matter which you've actually done, as the optional units are all 60 GLH, but I had to pick something.
2. I've assumed that you've obtained grades for 9 units so far, the 8 you mention as "3 passes, 1 merit, and 4 distinctions" plus the "one near pass" you mention later.
3. I've assumed that the near pass was in one of the three 120 GLH external units rather than in the single 90 GLH external unit (Unit 1).
4. For each external (examined) unit, I've assumed you were as close to the mid-point of the grade as I can get. (You get more points the closer you were to the next grade boundary.)
5. I've assumed that the merit you have for an internal unit is in one of the larger units, and the distinctions are for the others (ignoring those you've yet to do).
6. I've assumed that for one of the remaining units you get a U (as you are clearly worried about your ability to pass it).
7. For the other internal units (where you normally get distinctions it seems), I've assumed you get merits - taking a slightly conservative view.
You will note that even with the U in one of the optional units, and "only" merits in the ones you've yet to do, you still get a DMM overall.The above may be wrong, as I've made
loads of assumptions. However,
it should hopefully give you some comfort regarding your "i'm scared i won't get into uni" concern. In all likelihood, you will. 
If you can correct any of my assumptions, and provide a grade per unit number, plus the unit number for those which you've yet to take, I can update the above. If you know your mark for each of the external exams, that would be even better. Alternatively, you can download the "BTEC Nationals - Grade Calculator" from the Pearson web site
here and play with it yourself.